Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2009-06-14
Phys.Rev.D80:034026,2009
Physics
High Energy Physics
High Energy Physics - Lattice
6 pp; v2 conforms with published version (one additional sentence and reference to clarify a point)
Scientific paper
10.1103/PhysRevD.80.034026
Comparisons of lattice-QCD calculations of semileptonic form factors with experimental measurements often display two sets of points, one each for lattice QCD and experiment. Here we propose to display the output of a lattice-QCD analysis as a curve and error band. This is justified, because lattice-QCD results rely in part on fitting, both for the chiral extrapolation and to extend lattice-QCD data over the full physically allowed kinematic domain. To display an error band, correlations in the fit parameters must be taken into account. For the statistical error, the correlation comes from the fit. To illustrate how to address correlations in the systematic errors, we use the Becirevic-Kaidalov parametrization of the D -> pi l nu and D -> K l nu form factors, and a analyticity-based fit for the B -> pi l nu form factor f_+.
Bernard Claude
de Water Ruth S. Van
DeTar Carleton
El-Khadra Aida X.
Evans Richard Todd
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